112 



BULLETIN 68, UNITED STATES NATIONAL MUSEUM. 



(Cat. no. 196234, U.S.N.M.), has furnished the description of the 

 nucleus. It has 9 post-nuclear whorls and measures: Length 5.2 mm., 

 diameter 2.1 mm. 



This is the largest species of this group known from the west coast 

 of America. 



TURBONILLA (MORMULA) REGINA, new species. 



Plate 11, fig. 1. 



Shell very large, elongate-conic, slender, pale chestnut. (Nuclear 

 whorls decollated.) Post-nuclear whorls well rounded, appressed at 

 the summit, moderately constricted at the periphery, marked at 

 irregular intervals by strong varices and by very regularly narrow, 

 low, rounded, slightly protractive axial ribs, of which 16 occur upon 

 the first and second, 18 upon the third, 22 upon the fourth, 24 upon 

 the fifth to seventh, 30 upon the eighth and ninth, 36 on the tenth, 40 

 on the eleventh and the penultimate whorl. Intercostal spaces 

 about one and one-half times as wide as the ribs, marked by 6 well 

 incised spiral lines, which extend strongly upon the sides of the ribs 

 and weakly over them; the space between these lines is marked by 

 numerous exceedingly fine, spiral striations. Sutures constricted. 

 Periphery of the last whorl slightly angulated, marked by an incised 

 spiral line. Base short, well rounded, marked by the feeble con- 

 tinuations of the axial ribs and numerous very fine, closely spaced, 

 wavy, spiral striations. Aperture rhomboidal; posterior angle 

 obtuse; columella strong, almost straight, decidedly revolute. 



The type (Cat. no. 162686, U.S.N.M.) was dredged at U. S. Bureau 

 of Fisheries station 2902 in 15 fathoms, temperature 45°, off Santa 

 Rosa Island, California. It has 13 post-nuclear whorls, having lost 

 the nucleus and probably the first post-nuclear whorl, and measures: 

 Length 19.6 mm., diameter 5 mm. 



We have examined the following specimens : 



a University of California station. 



